This is a non-uncommon mistake. People, such as the author, seem to think that the UUID is a hex string containing dashes, since that is the format that they mo

This is a non-uncommon mistake. People, such as the author, seem to think that the UUID is a hex string containing dashes, since that is the format that they most frequently see them represented. You are correct that a UUID is a 128 bit identifier, and so, fits in 128 bits.